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2Sheets--Sh.eet 1 K. D. BISHOP & A. G. CLASS. Pressure Regulator for" Air Compressors. No. 229,083. 1 Pat'entedJune 22,1880.

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ZSheets-Sheet2. K. D. BISHOP & A. G. CLASS. Pressure Regulator for Air Compressors.

No. 229,083. Patented June 22,..1880.

Hiram, PHOTO-LITHDGRAFHER, WASHINGTON. 01c.

UNITED STATES PATENT OFFICE.

KIRK DJBISHOP AND ALBERT G. CLASS, OF CLEVELAND, OHIO, ASSIGNORS TO SAID BISHOP.

PRESSURE-REGULATOR FOR AIR-COMP-RESSO'RS.

SPECIFICATION forming part of Letters Patent No. 229,083, dated June 22, 1880.

Application filed December 13, 1879.

To all whom it may concern Be it known that we, KIRK D. BISHOP and ALBERT G. GLAss, of Cleveland, in the county of Guyahoga and State of Ohio, have invented certain Improvements in Pressure-Regulators for Air-Compressors, of which the following is a specification.

The first part of our invention relates to a device for regulating or maintaining a uniform 1o pressure in an air-receiver when the compression of the air therein is effected by the admission of water or other inelastic fluid under pressure.

' The secondpart of our invention relates to a device to be used in connection with the aforesaid pressure-regulator and a reciprocating, oscillating, or vibrating compressor, and to be operated thereby, for directing the flow of the compressing-fluid into that chamber or part in which the air-pressure has been reduced by drawing off; and our invention therein consists in the peculiar construction, arrangement, and combination of the various operative parts of our device, as more fully hereinafter described and shown.

In order that persons skilled in the art may know how to make and use our device, we will now proceed to fully describe the same, referen ce being had to the accompanying drawings.

Figure 1, Sheet 1, is a perspective view, showing our devices as arranged for use in connection with an oscillating double compressor, such as is employed for compressing air into beer barrels by admitting water under pressure into the chambers alternately. Fig. 2, Sheet 2, is a vertical section through the valve which directs the flow of the compression-water into either of the oscillating chambers shown in elevation behind it. Fig. 3 is 0 a longitudinal vertical section of the pressure-regulator. Fig. 4 is a transverse vertical section of thesame and of the delivery-valve. Fig. 5 is a vertical section of the regulator piston and its stem removed from the cylinders. Fig. 6 is a detached sectional elevation of the delivery-valve.

In the drawings, A and A represent two cylindrical chambers or receivers, in which the part of each compressor, with an outwardlyopening check-valve for each, conducts the compressed air from one at a time to the beercask in which it is desired to maintain a 0011- stant and unvarying air pressure until its contents have been entirely drawn off.

The compression of the air in the receivers A A is effected through the alternative admission of water under pressure into their lower parts from the pipes of the ordinary or municipal supply.

The air-compressors shown form no part of the present invention, but are introduced to show the applicability of our newly-invented regulating devices, the firstof which,the press- Lire-regulator, we will now proceed to describe.

The regulator consists of three superposed cylinders, G 0 C the lower one, 0, being considerably greater in bore than the others, and separated from them by spacer-posts. 7 5

A cup-leather, a, forms a packing for each joint, as well as for the cup-piston D and its hollow stem or piston-rod D. At 12, in the middle cylinder, 0, there is an inlet for water under continuous pressure, which may be taken from the municipal service-pipes. In the larger or lower cylinder there is an outlet through the delivery-pipe 0.

At cl ports are drilled in the stem, D, which is pressed downward by a weighted lever, E, acting on its upper end; or an adjustable spring may be used for thatpurpose.

When the hollow stem and piston are moved down so that the ports 01 are below the packing a at the top of the middle cylinder, water 0 will flow through them down into the cylinder 0, whence it is conducted by the pipe 0 toward the compressors, following the course of the' arrows shown in Fig. 4.

It will be evident that so long as the press- 5 I raise the piston to the position seen in Fig. 3, mo

' pression will be uniform, although the head of the compressing-fluid may fluctuate.

The enlarged or cup-shaped piston D renders the valve much more sensitive to changes in the back-pressure than if the stemD were carried down into the lower cylinder. When used in connection with the class of compressors shown it becomes necessary to provide a means for automatically directing and changing the flow of the compressing-fluid as may be required. To this end we take three superposed cylinders, F F F, and secure them to gether by outside bolts passing through both heads, which, as well as the two intermediate joints, are packed with cup-leathers e, as seen in Figs. 2 and 4. A plunger, G, plays through both heads, motion being given it by a lever, H, at its upper end, engaging with two studs, 9, on one of the compressirig-chambers or any equivalent means may be used to give the plunger the required movement at the proper times. The central portion of the plunger is hollow, and into it two series of ports, ff, are drilled, as seen in Figs, 2, 4, and 6. The delivery-pipe c from the regulator enters the middle chamber, F. An outlet, h, connects the upper chamber, F, with the compressingchamber A, through the flexible tube B, and a similar outlet, h, connects the lower chamber,

' F, with the compressor A,

through the flexible tube B.

The cup-leathers e prevent the water from passing directly from the middle chamber, F, into the others; but it is conveyed into one or the other through the two sets of ports f f as the plunger is moved up or down, thence to either compressor.

The entire apparatus is mounted in a shallow tray, I, provided with a waste, t, so that the water discharged from the compressors and all waste and leakage may be carried off.

What we claim as our invention is- 1. An air-compressor regulator consisting of cylinders U C 0 having openings 1) 0,1101- low piston-rod D, with its ports d and cuppiston D, and weighted lever E, constructed, arranged, and operating substantially as and for the purpose set forth.

2. In combination with an oscillating aircompressor, the regulator constructed as described, and the cylinders F F F openings 0 h h, hollow plunger G, and ports ff, substantially as described and shown.

3. The cylinder F F F, with its openings 0 h h, and the hollow plunger G, with its ports ff, in combination with a regulating-valve for admitting water under pressure therein, and an oscillating air-compressor, and a means for operating said plunger, substantially as set forth.

KIRK D. BISHOP.

ALBERT G. GLASS.

. Witnesses:

J 0s. H. DoLL, JOHN G. BRIEGLET. 

